There are plenty of options (even good free ones) but most are either text editors or IDEs, but as Steve said - it really depends on what you want to do with it.

Notepad++ is a good free text editor with syntax highlighting and code completion (to a point), and it supports more languages than I know what to with (HTML, XHTML, XML and CSS, but mention a select few). You'll have to point a browser to the file to view it though.

BTW the one you found is one I hadn't heard of but it is supposed to be "WYSIWYG", which really is a myth since not all browsers renders things the same anyway. It seems a bit pricey though.